Thermal management for head mounted wearable device
Systems and methods for thermal management in wearable computing devices are provided. Thermal management strategies included in the wearable computing device provide for dissipation of heat generated by electronic components installed within enclosures, or housings, of the wearable computing devices to maintain operability of the electronic components, maintain functionality and/or operability of the wearable computing device, and maintain user comfort while the wearable computing device is worn. The enclosure includes a multilayered stack of materials including a thermal layer embedded within insulating layers. The thermal layer may be shaped so as to direct the spreading of heat in a desired direction, to maintain surface touch temperatures within allowable ranges, and maintain internal enclosure temperatures within operating ranges of the electronic components.
1. A wearable computing device, comprising:
a frame; and
an enclosure formed by a portion of the frame, the enclosure defining an interior space, the enclosure including:
a first layer adjacent an interior of the enclosure;
a second layer adjacent the first layer; and
an intermediate layer positioned between the first layer and the second layer, the intermediate layer including:
a first section including a first material having thermal properties configured to spread heat generated by at least one heat generating component installed in the interior space in the enclosure; and
a second section including a second material having thermal properties configured to inhibit further spreading of heat through the enclosure.
2. The wearable computing device of claim 1 , wherein the wearable computing device is a head mounted wearable computing device, and wherein the frame includes:
a front frame portion;
a first arm portion rotatably coupled to a first end portion of the front frame portion; and
a second arm portion rotatably coupled to a second end portion of the front frame portion.
3. The wearable computing device of claim 2 , wherein the enclosure is defined in at least one of the front frame portion, the first arm portion, or the second arm portion.
4. The wearable computing device of claim 1 , wherein
the first layer is a polycarbonate based material;
the second layer is a polycarbonate based material;
the first section of the intermediate layer is one of an aluminum material, a copper material, or a graphite material; and
the second section of the intermediate layer is a polycarbonate based material.
5. The wearable computing device of claim 1 , wherein a coefficient of thermal conductivity of the first material of the first section of the intermediate layer is greater than a coefficient of thermal conductivity of the second material of the second section of the intermediate layer.
6. The wearable computing device of claim 1 , wherein at least one of:
a coefficient of thermal conductivity of the first material of the first section of the intermediate layer is greater than a coefficient of thermal conductivity of a material of the first layer; or
a coefficient of thermal conductivity of the first material of the first section of the intermediate layer is greater than a coefficient of thermal conductivity of a material of the second layer.
7. The wearable computing device of claim 1 , wherein the enclosure comprises a compression molded non-homogeneous thermally dissipative enclosure including a bonded layered stack of materials including the first layer, the second layer, and the intermediate layer.
8. The wearable computing device of claim 7 , wherein
the first layer is a thin film plastic based layer;
the intermediate layer is a contoured sheet of thermal material, the contoured sheet of thermal material defining a thermal path from the at least one heat generating component through the enclosure; and
the second layer is a thin film plastic based layer.
9. The wearable computing device of claim 1 , wherein the enclosure comprises a sintered non-homogeneous thermally dissipative enclosure formed of a laminated stack of materials, wherein:
the first layer is plastic based layer;
the intermediate layer is a sintered metal matrix layer; and
the second layer is a plastic based layer.
10. The wearable computing device of claim 1 , wherein a peripheral contour of the first section of the intermediate layer corresponds to a thermal path in the enclosure for spreading of heat generated by the at least one heat generating component.
11. The wearable computing device of claim 1 , wherein a peripheral contour of the second section of the intermediate layer is complementary to the peripheral contour of the second section of the intermediate layer, such that further spreading of heat is inhibited by a boundary between the first section and the second section.
12. The wearable computing device of claim 1 , wherein the first layer defines an interior surface of the enclosure and/or the second layer defines an exterior surface of the enclosure.
13. A head mounted wearable computing device, including:
an enclosure defining an interior space and including:
a first layer adjacent the interior space;
a second layer adjacent the first layer; and
an intermediate layer positioned between the first layer and the second layer, the intermediate layer including a thermal layer,
wherein a shape of the thermal layer defines a thermal path for spreading of heat generated by at least one heat generating component installed in the interior space in the enclosure, and
wherein a coefficient of thermal conductivity of the thermal layer is greater than a coefficient of thermal conductivity of the first layer, and the coefficient of thermal conductivity of the thermal layer is greater than a coefficient of thermal conductivity of the second layer.
14. The head mounted wearable computing device of claim 13 , wherein the intermediate layer includes an insulating layer positioned laterally adjacent to the thermal layer, wherein a coefficient of thermal conductivity of the thermal layer is greater than a coefficient of thermal conductivity of the insulating layer.
15. The head mounted wearable computing device of claim 14 , wherein
a peripheral contour of the thermal layer corresponds to a thermal path in the enclosure for spreading of heat generated by the at least one heat generating component; and
a peripheral contour of the insulating layer is complementary to the peripheral contour of the thermal layer, such that further spreading of heat is inhibited by a boundary between the thermal layer and the insulating layer.
16. The head mounted wearable computing device of claim 14 , wherein
the first layer is a polycarbonate based material;
the second layer is a polycarbonate based material;
the thermal layer of the intermediate layer is one of an aluminum material, a copper material, or a graphite material; and
the insulating layer of the intermediate layer is a polycarbonate based material.
17. The head mounted wearable computing device of claim 13 , wherein the enclosure comprises a compression molded non-homogeneous thermally dissipative enclosure including a bonded layered stack of materials including the first layer, the second layer, and the intermediate layer, wherein:
the first layer is a thin film plastic based layer;
the thermal layer is a contoured sheet of thermal material, the contoured sheet of thermal material defining a thermal path from the at least one heat generating component through the enclosure; and
the second layer is a thin film plastic based layer.
18. The head mounted wearable computing device of claim 13 , wherein the enclosure comprises a sintered non-homogeneous thermally dissipative enclosure formed of a laminated stack of materials, wherein:
the first layer is plastic based layer;
the thermal layer is a sintered metal matrix layer; and
the second layer is a plastic based layer.
19. The head mounted wearable computing device of claim 13 , wherein the first layer defines an interior surface of the enclosure and/or the second layer defines an exterior surface of the enclosure.
20. A wearable device, comprising:
a frame defining a structure of the wearable device; and
an enclosure formed by a portion of the frame, the enclosure defining an interior space, the enclosure including:
a first layer adjacent an interior of the enclosure;
a second layer adjacent the first layer;
a thermal layer positioned between the first layer and the second layer, wherein a contour of the thermal layer defines a thermal path for spreading of heat generated by at least one heat generating component installed in the interior space in the enclosure; and
an insulating layer positioned between the first layer and the second layer, wherein a contour of the insulating layer is complementary to the contour of the thermal layer, such that further spreading of heat is inhibited by a boundary between the thermal layer and the insulating layer.
21. The wearable device of claim 20 , wherein:
a coefficient of thermal conductivity of the thermal layer is greater than a coefficient of thermal conductivity of the first layer, and
the coefficient of thermal conductivity of the thermal layer is greater than a coefficient of thermal conductivity of the second layer.
22. The wearable device of claim 20 , wherein the first layer defines an interior surface of the enclosure and/or the second layer defines an exterior surface of the enclosure.